RASPBERRY INSECTS 85 



rows and cause long jagged wounds in the canes; 

 the nymphs and adults live largely on plant-lice and 

 other insects and must be regarded as beneficial; 

 the wounds made by depositing the eggs injure the 

 canes. 



Control — If abundant, affected canes should be 

 cut out in the fall and winter. 



The red-necked cane-borer " (Agrilus ruficollis) 

 Order — Coleoptera 



The stems of raspberries sometimes bear irreg- 

 ular swellings or galls two or more inches in length 

 and gradually tapering toward either end; caused 

 by a beetle about one-third inch in length with red- 

 dish ''neck" or thorax and black head; deposits 

 ^gg in June in bark near base of leaf on new 

 growth ; young larva bores upward in sapwood pass- 

 ing around stem in a spiral manner thus girdling 

 cane ; it is a flat yellowish-white grub about Y4 inch 

 in length ; completes growth in spring and changes 

 to pupa in cell in pith. 



Control — Cut and burn infested canes during 

 fall and winter; destroy wild berry bushes in which 

 the beetles may breed. 



The raspberry cane-maggot ^^ (Phorbia riihi- 



z'ora) 

 Order — Diptera 



This is a small fly that attacks the new shoots of 

 the raspberry in the spring; the attacked shoots wilt 

 and droop; the tip shrinks, turns dark blue and 

 dies. 



As soon as the new shoots appear in the spring 

 the fly deposits its eggs in the axils of the tip leaves ; 

 the white maggot burrows to the pith of the stem 



22 Smith— N. J. Expt. Stat., Special Bull. N. 



23 Slingerland — Cornell Univ. Expt. Stat., Bull. 126. 



